ice-bound 
adjective
Completely surrounded or covered by ice: the lake was ice-bound...
- The remainder focuses on Jack's efforts to trek cross-country through the blizzards to save his estranged son Sam, who's trapped in ice-bound Manhattan.
- I recall a mini-series on Cook's life in which, ice-bound and with the ship possibly breaking up, he commented to an officer, ‘I can't swim.’
- The Arctic's ice-bound seas are like unscaled mountains to climbers: they must be attempted because they are there.